MEXICO CITY , Mexico -LRB- CNN -RRB- -- Arrest warrants have been issued for another nine people associated with a fire at a day-care center in northwestern Mexico in June that killed 48 children , the state-run Notimex news agency said Saturday .

Two girls lay flowers during a funeral of one of the 48 children who died in the day-care fire .

The warrants are for the owners and legal representatives of the ABC day-care center in the city of Hermosillo in Sonora state , which burned down June 5 , Notimex said .

Officials have determined that the fire started at an air-conditioning unit at a government-owned warehouse in the same building as the day-care center . Fourteen children remain hospitalized , Notimex reported earlier .

The latest arrest warrants are the third group to be issued since the fire .

On Wednesday , the Mexican federal attorney general 's office ordered the arrest of nine public officials from the Mexican Institute of Social Security , which owned the day-care center , as well as private individuals connected to the facility .

Two weeks earlier , Mexican officials announced they had ordered the arrests of 14 people who worked at the warehouse .

Parents of the dead children and others have held demonstrations in Hermosillo and Mexico City to protest what they see as foot-dragging by authorities in punishing the responsible parties .

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Arrest warrants issued for nine people in connection with Mexico day-care fire

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Forty-eight children died in fire ; 14 remain hospitalized

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Fire started in air-conditioning unit in building , officials say